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Common Unit Repurchase and Retirement (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 23 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 29, 2012 | Jan. 31, 2012 | Dec. 31, 2011 | Nov. 30, 2011 | Oct. 31, 2011 | Mar. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010 | Jun. 30, 2012
Partnerships repurchase units |  |  |  |  |  |  |  |  |  |  |
Total Number of Units Purchased as Part of a Publicly Announced Plan or Program | 277 | 1,220 | 2,007 | 215 | 226 | 1,497 | 2,448 |  | 2,108 | 1,197 | 7,250
Average Price Paid per Unit | $ 4.54 | $ 4.63 | $ 5.21 | $ 4.95 | $ 4.96 | $ 4.62 | $ 5.17 | $ 4.94 | $ 5.19 | $ 4.44 |
Maximum Number of Units that May Yet Be Purchased Under the Plan II Program |  | 277 | 1,497 | 3,504 | 3,719 |  | 1,497 | 7,250 | 3,945 | 6,053 | 7,250

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